where In is the identity matrix of order 2.
and we know that-
A(adj A) =|A|In ...(2)we can prove this as,
As we know that,
AA-1 = Identity matrix = I
A(adj A) =|A|In
Comparing (1) and (2), we get,
|A| = 8
Hence, the value of |A| is 8.
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